I have the same issue.
hardware and software both at 3.11
chenges to presets do not save either from. Hardware or hx edit.
have restarted and reset hardware and computer numerous times,
have reset to factory defaults.
nothing saves save options come up as expected and it appears to save but switching to next preset then switching back changes have not saved,
same behaviour on completely new preset and existing presets.
hx stomp is now a pretty coloured brick.